ladder-type system
81Social mobility — Sociology …
82Dam — This article is about structures for water impoundment. For other uses, see Dam (disambiguation). Hoover Dam, a concrete arch gravity dam in Black Canyon of the Colorado River. Lake Mead in the background is impounded by the dam …
83German fire services — The Feuerwehr is a number of German fire departments. The responsible body for operating and equipping fire departments are the German communities ( Gemeinden ) and cities ( Städte ). By law, they are required to operate a fire fighting force… …
84Wing Enterprises — Infobox Company company name = Wing Enterprises company type = Private company slogan = Strength Safety Versatility foundation = 1970s location = Springville, Utah key people = Harold R. Wing, Chairman of the Board FounderH. Arthur Wing,… …
85San Ramon Valley Fire Protection District — The San Ramon Valley Fire Protection District is an autonomous Special District as defined under the Fire Protection District Law of 1987, Health and Safety Code, Section 13800, of the State of California. The District’s service area encompasses… …
86Christianity — /kris chee an i tee/, n., pl. Christianities. 1. the Christian religion, including the Catholic, Protestant, and Eastern Orthodox churches. 2. Christian beliefs or practices; Christian quality or character: Christianity mixed with pagan elements; …
87United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …
88History of evolutionary thought — This article is about the history of evolutionary thought in biology. For the history of evolutionary thought in the social sciences, see Sociocultural evolution. For the history of religious discussions, see History of the creation evolution… …
89Mechanical filter — Figure 1. A mechanical filter made by the Kokusai Electric Company intended for selecting the narrow 2 kHz bandwidth signals in SSB radio receivers. It operates at 455 kHz, a common IF for these receivers, and is dimensioned 45×15×15 mm ( …
90Escalator — For the album by Sam Gopal, see Escalator (album). Escalators in a Copenhagen Metro station, Denmark, 2007 Escalator in action, 2011 An e …
